Just a few hours ago, DICE unveiled some details as to what the
plot in Battlefield 4 is about.

"The world is on the brink of chaos, China is the tinderbox
and you and your squad are the inadvertent spark that could ignite
a global conflict. This is Battlefield 4. As Sergeant Daniel
Recker, you play as a member of an elite group of unlikely heroes
known as Tombstone Squad, navigating the turmoil around you as you
fight to save the final hope for peace."

The article then goes on to say that the intel that Tombstone
Squad obtained in Baku, Azerbaijan confirmed that China is about to
undergo a coup, with Admiral Chang at the head and the Russians
supporting him. Additionally, the U.S. has been implicated in the
assassination of China's "future l…